The Boeing Co., St. Louis, Missouri, is awarded a cost-plus-fixed-fee, cost-plus-incentive-fee, fixed-price incentive (firm-target) $657,090,000 modification (P00067) to a previously awarded contract (N0001918C1012). This modification adds scope for the production and delivery of two additional MQ-25 System Demonstration Test Article aircraft (air vehicles four and five), to include associated tooling and communication system changes for the Navy. Additionally, this modification definitizes obsolescence phase two for non-recurring engineering to address product baseline obsolescence to support low-rate initial production for the MQ-25 Stingray program. Work will be performed in St. Louis, Missouri (45.43%); Goleta, California (7.2%); Endicott, New York (6.86%); Malabar, Florida (4.93%); San Diego, California (3.82%); Torrance, California (2.86%); Indianapolis, Indiana (2.66%); Clearwater, Florida (1.82%); Longueuil, Quebec, Canada (1.75%); Cedar Rapids Iowa (1.6%); Irvine, California (1.35%); various locations within the continental U.S. (CONUS) (19.12%); and various locations outside the CONUS (0.60%), and is expected to be completed in October 2028. Fiscal 2023 research, development, test, and evaluation (Navy) funds in the amount of $288,635,000 will be obligated at the time of award, all of which will expire at the end of the current fiscal year. Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.